This song of Daas Dev is made up of two different (to the best of my knowledge) poems (or I could say, long couplets) of Faiz Ahmad Faiz. The first one begins at raat yoon, and goes till qaraar aa jaaye. The second one begins at tanhaayi mein, and goes till gardan-e-mahtaab mein baahein. At the end of the song, the two couplets have been joined quite beautifully. Here though, the lines aren't repeated for the sake of simplicity of understanding.

This song is a story of childhood friends, one of whom is getting married, as the other feels that the friendship is about to end now, while the other tells him that it's not going to happen, and it comes to a resolution.